Table of Content

28 February 2007, Volume 13 Issue 1

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Articles

Wireless Sensor Network Topology for Road Traffic

XIE Wei hao;CHEN Hui min;ZHENG Lin shui;ZHOU Wei

2007, 13(1):  1-3 . 

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Applications of wireless sensor network in road traffic monitoring are rapidly expanded. Traditional topology places network nodes randomly, leading to waste of energy and decreased network throughput. We propose a new way to form the network topology for road traffic. This is achieved by applying a new data frame and a linear placement strategy to reduce both the network load and the redundant information transmission. Simulation results show that the proposed strategy can save node energy, prolong the network life span, and increase network throughput.

Automatic Test Pattern Generation for Multi Clock Digital System Based on S&CCT

ZHANG Jin yi;XIONG Yan shuang

2007, 13(1):  4-9 . 

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This paper presents a novel method of automatic test pattern generation for multi clock system, called S&CCT. The method classifies the system into equivalent clocks and serial clocks according to some regulations, and fixes the rightness of capture sequence. A concurrent fault simulator is used to simulate test vectors both on logic and timing in ATPG. The test vector generat or uses the simulating information, avoiding generating invalid vectors. Experiments show that S&CCT can reduce the number of test vectors by about 50% comparing with common methods, and has no influence on the cost of circuit hardware.

Dual Polarization Aperture Coupled Microstrip Element and Array Antenna with High Isolation

LIANG Xian ling;ZHONG Shun shi;WANG Wei

2007, 13(1):  10-13 . 

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A novel dual polarization microstrip patch element and its array are proposed. The element is fed through two orthogonal H shaped slots with high isolation. The measured isolation is better than 42 dB in an operation bandwidth of 8.8～9.8 GHz. As a sub array for SAR applications, the feed network of an array consisting these elements has a simple configuration. An eight element linear array has been designed and fabricated. Experimental results are in good agreement with the theory, with high isolation (>30 dB) and low cross polarization characteristics (<-32.5 dB).

A Novel Three Section Re entrant Hybrid Coupler

YI Da wei;LIU Jian YAO;Shou quan

2007, 13(1):  14-17 . 

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A novel structure of three section re entrant hybrid coupler is proposed with a simple structure, easy debugging and good performance. In addition, a three section re entrant hybrid coupler with ternary bandwidth (0.8～2.4 GHz) has been designed and tested. The measured performance shows good agreement with theoretical prediction. Experimental data well agree with the simulated results.

QoS Routing Algorithm for Ad Hoc Network Based on Multimedia Service

ZHANG Jie;WANG Han xing;LU Gui lin

2007, 13(1):  18-21 . 

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Current QoS routing algorithms used in Ad Hoc networks are unsuitable for multimedia networks critical to multiple objects. This paper presents a QoS routing algorithm based on multi object programming, which optimizes the routing cost and the data loss rate based on constraints of the delay in multimedia real time services. Feasibility of the algorithm is verified with an example.

Multi object Fuzzy Reliability Optimization of Planar Gear Transmission Based on Improved Genetic Algorithm

ZHANG Kai yan;MO Yun hui;DENG Zhaoyi;et al

2007, 13(1):  22-27 . 

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This paper establishes a multi object fuzzy reliability optimization model with fuzzy reliability optimization theory and a matter element method. By using im proved operators, simulating annealing and lozenge thinking, an improved genetic algorithm that adopts a real code method is obtained. In this algorithm, crosso ver rate and mutation rate can be adjusted automatically during evolution. Optim ization of planar gear transmission with multiple objects is achieved.

Influence of Conditionally Permutable Subgroups on the Structure of Finite Groups

HU Yu sheng;GUO Xiu yun

2007, 13(1):  28-32 . 

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A subgroup H of a finite group G is said to be conditionally permutable in G if for every subgroup T of G there exists an element x ∈ G such that HTx=TxH. If H is conditionally permutable in every subgroup of G containing H ,then H is said to be completely conditionally permutable subgroup in G .In this paper,some new results are obtained according to the conditional permutability of some subgroups.

Asymptotic Properties of Hypercubes

XIE Fu sheng;HE Bin wu

2007, 13(1):  33-36 . 

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Let K be a hypercube in R n. The asymptotic properties of two affine invariant m2(K) and S2(K) of a random simplex inside K are studied. As an application of the method, the isotropic constant L K of parallelotope with volume |K|=1 and center of mass at the origin is obtained.

Computation of the Determinant Formulas of Function Valued Padé Type Approximation

SHEN Jin dong;GU Chuan qing

2007, 13(1):  37-40 . 

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In this paper, computation of two special determinants that appear in the constr uction of a function valued Padé type approximation for computing the second kind Fredholm integral equation is investigated. Since the common computational approach of determinant cannot be used in this case, the well known Schur complement theorem is used in this paper.

Isotropic Constant of Some Special Geometric Bodies

WU Li rong;HE Bin wu

2007, 13(1):  41-46 . 

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Let K∈ 〖WTHZ〗R n be a convex body with volume | K |=1 and c enter o f mass at the origin. L K is an isotropic constant of K . Finding the le ast upper bound of L K is a well known open problem of Banach space local theory. Now the best estimate of upper bound is L K

Extension of Integral Level Set Method for Global Optimization to Bounded Measurable Functions

ZHU Huan yu;WU Dong hua;HUANG Wen jie

2007, 13(1):  47-50 . 

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An integral level set method for solving global optimization problems was propo sed in 1978 and improved in 1999.This method has only been used in continuous fu nctions in a closed domain.In this paper,the method is extended to bounded measu r able functions by introducing the concept of essential infimum and the property of Lebesgue integral.An integral level set conceptual algorithm is proposed for bounded measurable functions,and an optimality condition is obtained.

An Equivalent Form of Extended Hardy Hilbert Integral Inequality

ZHONG Wu yi;YANG Bi cheng

2007, 13(1):  51-54 . 

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In this paper, by introducing a weight function ω λ(p,r,t) , an equivalent form o f the extended Hardy Hilbert integral inequality is presented. It is shown that a constant factor is the best possibility.

Application of Differential Quadrature Method to Space Axial Symmetry Problems in Elasticity

LI Ying;CHENG Chang jun

2007, 13(1):  55-61 . 

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Based on the principle of differential quadrature method (DQM), the DQ discretization equations of space axial symmetry problems in elasticity in two cases of static state and free vibration are derived, and numerical calculations are implemented in the present paper. The effect of spacing points on the numer ical results is considered when different spacing points are adopted. Comparison between the results and those obtained from FEM shows that the differential qua drature method has some merits such as higher accurate, good convergence, few gr id points and calculation workload.

Rayleigh Wave in an Incompressible Saturated Viscoelastic Porous Medium

ZHANG Yan;YANG Xiao

2007, 13(1):  62-67 . 

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Based on the theory of porous media and viscoelasticity, the behavior of Rayleigh waves in an incompressible liquid saturated viscoelastic porous hal f space is investigated. Under the assumptions of microscopic incompressibility o f solid and fluid phases and the solid skeleton behaving as viscoelastic one and infinitesimal deformation, an analytical dispersion relation is obtained by usi ng Helmholtz decomposition. Influences of the material parameters on the phase v elocities and attenuation of Rayleigh waves are analyzed numerically for the sat urated standard linear viscoelastic porous medium with both permeable and imperm eable surfaces. It is shown that the influence of the viscosity of the solid ske leton is remarkable, and it depends on the conditions of the permeabilities of t he surfaces.

Analyzing the Induced Radiation of High Energy Electron Accelerator with the Monte Carlo Method—Microcosmic Analysis

HE Xin fu;WANG Chuan shan;LUO Wen yun;et al

2007, 13(1):  68-72 . 

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In a high energy electron accelerator, when high energy electrons inte ract with matter, an electromagnetic shower is induced, producing an induced rad iation field. In this paper, the Monte Carlo method is used to calculate the ind uced radiation of high energy electron accelerator induced by neutron. It is us e ful to establish a waiting time rule. The total cross section of radiation dam ag e of the interaction between the neutron and Fe, Cu and Ni is calculated using t he MSDM code. Distribution of the radioisotope and the production cross sections induced by the interaction of different energy neutron and accelerator are then obtained. A comparison of the results is presented.

Entanglement of Two Coupled Two Level Atoms in Tavis Cummings Model

ZHANG Ya li;DONG Chuan hua

2007, 13(1):  73-76 . 

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Entanglement is used to measure correlation between entangled subsyste ms. In this paper, we use Von Neumann entropy to study evolution of the entangle ment for two coupled dual level atoms in the process of interaction between ato m s and the field initially prepared in a coherent state. We show that the entangl ement is related to coupled strength, detuning and intensity of the field. For t wo atoms initially prepared in the Bell basis, with coupled strength between two atoms and detuning between atoms and the field increased, entanglement and its oscillating frequency will increase. But increasing the intensity of the field l eads to decrease of entanglement.

Synthesis of Benzimidazoles from o Nitroanilines in a One Step Reductive Cyclization Process

ZHU Hong;HUANG Wen zhong;PU Jia qi

2007, 13(1):  77-81 . 

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Benzimidazoles ( 3a 〖WTHZ〗c〖WTBZ 〗, 5〖STBZ〗〖WTHZ〗a 〖WTHZ〗c ) were synthesized in a one step reductive c yclization reaction of o nitroanilines ( 1〖STBZ〗, 4〖STBZ 〗) and aryl aldehydes ( 2〖STBZ〗〖WTHZ〗a 〖WTHZ〗c ). Sodium dithionite was used as a reductive reagent. Selectivity was found when more than one nitro group existed in the substrates. A mixture of ethanol and water was u sed as solvent. The reaction was accelerated by water.

Rules of Ozone Decomposition in Oxygen

TAN Gui xia;CHEN Ye pu;XU Yin juan;et al

2007, 13(1):  82-84 . 

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The UV absorption curves of gaseous ozone in oxygen at different time and diffe rent temperature were investigated by using UV 2501 spectrophotometer. Rules of ozone decomposition in oxygen in normal condition were obtained. The results in dicate that the self decomposition reaction of ozone in oxygen is approximately the first order reaction. The average apparent activation energy is about 2.43 ×104 J?mol-1 . The velocity constant is k =95.6 exp(-2.43×104/ R T ) min-1 . The reproducibility of related date appeared good. It is concluded that the half life of ozone in oxygen is much longer than in atmosphere in evi dence.

Inhibitory Effect on Lipase of Alkaloid Derived from Lotus Leaf

ZHU Xiao qing;LU Jing ci;HUO Shi xin;et al

2007, 13(1):  85-87 . 

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Ethanol extract of lotus leaves was first obtained, and the extract wa s then purified using chloroform. The effects of several factors on inhibitory a ctivity are studied. An inhibitory mechanism of the lotus leaf derived lipase i nhibitor is proposed. This inhibitor does not act directly on the lipase molecul e but blocks the enzyme substrate contact by modifying the emulsion of the lipi d substrate. The inhibitory constant ( K i) is 0.2 mg/mL. Based on Dixon plo ts and Linweaver Burk plots, the lipase inhibitor demonstrates uncompetitive inhibiti on for lipase.

Construction and Characterization of a Dunaliella viridis Bacterial Artificial Chromosome Library

MENG Xiang zong;YANG Xiao wu;GUAN Zhen wei;et al

2007, 13(1):  88-93 . 

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Dunaliella viridis has outstanding ability to adapt to hyper salinity, and is a model system for plant salt tolerance mechanism study. We constructed a bac terial artificial chromosome library of Dunaliella viridis , using vector pCC 1 BAC. The library consisted of 9 216 clones on 96 96 well plates. The average in sertion size was about 55 kb. A four dimensional PCR screening system was devel oped, by which single positive clone could be obtained with 4 rounds of PCR. Bas ed on the sequences of two cDNAs of Dunaliella viridis isolated in our lab ( DvSPT2 and DvTPSP respectively), we isolated 4 positive clones for each gene by PCR, indicating that the library had about 4 times genome coverage.

Effects of Tertiary Butylhydroquinone and 1,1 di(2′,5′dihydroxy 4′ butyl phenyl)ethane in Curing and Prevention of ExperimentalAtherosclerosis

GU Rui fang;WENG Xin chu

2007, 13(1):  94-98 . 

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This study is to observe the effect of tertiary butylhydroquinone (TBH Q) and 1,1 di(2′,5′ dihydroxy 4′ butyl phenyl)ethane (DTBHQE) in an expe rimental atherosclerosis (AS) model in quails. AS model was produced in quails by admini stration of a high lipid diet, DTBHQE, TBHQ and Fenofibrate were fed for 8 and 1 4 weeks respectively. The total cholesterol (TC), triglyceride (TG), high densit y lipoprotein cholesterol (HDL C), low density lipoprotein cholesterol (LDL C) a nd total anti oxidative capacity (T AOC) in serum, and malondialdehyde (MDA) c on tent in liver were measured. Histopathological examinations of aorta and liver w ere observed under the light and electric microscope. The results show that, com pared with AS model quails, the AS plaque of aortic and coronary arterial endoth elium in quails fed with TBHQ and DTBHQE for 8 or 14 weeks were significantly de creased. The serum TG, TC, HDL C, T AOC and the liver MDA of TBHQ group were o bv iously lower than AS model group. Serum TG, TC, HDL C, LDL C T AOC and the li ver MDA content of DTBHQE groups were obviously lower than AS model group. All the above indicates that TBHQ and DTBHQE have effective action of anti AS.

UBROAD: A Web Based Platform of Gene and Protein Data

GUO Jing kang;ZHANG Xiang yun;YANG Xu zhi

2007, 13(1):  99-104 . 

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High throughput experiments like microarray or protein mass spectromet ry can produce huge amount of data efficiently. These data, after some basic pre processing, are often presented in the form of a list of gene/protein identifier s accompanied by (semi) quantitative experimental data such as expression profil es. It is necessary to obtain detailed annotation information about these genes/ proteins to further analyze these data and to extract biological meanings. We de veloped a web based platform UBROAD (Unified Batch Retriever of Annotation Data ) to facilitate quick and efficient retrieval of annotation data for genes and pr oteins from various sources. UBROAD integrates several biological data sources i ncluding NCBI, Swiss Prot, BIND, Enzyme, genetounigene and genetoaccession, and supports mixed searches of eight types of identifiers including Uniprot/trEMBL A C, Uniprot Entryname, Genbank Protein Accession Number, Genbank mRNA gi, Genbank mRNA Accession Number, Gene name, Gene ID and Unigene ID. The output file inclu des 38 annotation items downloadable in the form of Microsoft Excel. UBROAD is f reely available at http://www.bioscience.org.cn/ubroad.

Evaluation of Profitability, Liquidity and Security of Commercial Banks with Optimal Parting of Ordered Samples

MAO Ding xiang

2007, 13(1):  105-110 . 

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Using factor analysis and optimal parting of ordered samples, this paper evaluat es the three basic targets of commercial bank operation: profitability, liquidit y and security. An empirical analysis of 14 commercial banks in China shows that the conclusion is reasonable and fit in with facts.